fix: keep terminal snapshots consistent while scrolling (#3928)

refs #3900

1 files changed, 11 insertions, 1 deletions

diff --git a/src/pane/terminal.rs b/src/pane/terminal.rs
index 071bb20a..b201702b 100644
--- a/src/pane/terminal.rs
+++ b/src/pane/terminal.rs
@@ -192,6 +192,8 @@ pub(crate) struct GhosttyPaneTerminal {
 }
 
 pub(crate) struct GhosttyPaneCore {
+    #[cfg(test)]
+    pub dirty_collection_hook: Option<Box<dyn FnOnce() + Send>>,
     pub terminal: crate::ghostty::Terminal,
     #[cfg(windows)]
     recent_fallback: windows_recent_fallback::Cache,
@@ -1145,6 +1147,8 @@ impl GhosttyPaneTerminal {
         key_encoder.set_from_terminal(&terminal);
         Ok(Self {
             core: Mutex::new(GhosttyPaneCore {
+                #[cfg(test)]
+                dirty_collection_hook: None,
                 terminal,
                 #[cfg(windows)]
                 recent_fallback: windows_recent_fallback::Cache::default(),
@@ -2363,7 +2367,13 @@ impl GhosttyPaneTerminal {
         self.core
             .lock()
             .ok()
-            .map(|mut core| ghostty_collect_dirty_patch(&mut core, area_width, area_height))
+            .map(|mut core| {
+                #[cfg(test)]
+                if let Some(hook) = core.dirty_collection_hook.take() {
+                    hook();
+                }
+                ghostty_collect_dirty_patch(&mut core, area_width, area_height)
+            })
             .unwrap_or(TerminalDirtyPatchOutcome::Fallback)
     }
 }